EP1953982A1 - Procédé et dispositif de synchronisation temporelle et d'analyse voisine pour les systèmes cellulaires OFDM - Google Patents

Procédé et dispositif de synchronisation temporelle et d'analyse voisine pour les systèmes cellulaires OFDM Download PDF

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EP1953982A1
EP1953982A1 EP07290144A EP07290144A EP1953982A1 EP 1953982 A1 EP1953982 A1 EP 1953982A1 EP 07290144 A EP07290144 A EP 07290144A EP 07290144 A EP07290144 A EP 07290144A EP 1953982 A1 EP1953982 A1 EP 1953982A1
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Prior art keywords
module
timing
preamble
frequency domain
offset
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German (de)
English (en)
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EP1953982B1 (fr
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Bogdan Franovici
Emmanuel Lemois
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Sequans Communications SA
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Sequans Communications SA
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Priority to AT07290144T priority Critical patent/ATE507644T1/de
Priority to EP07290144A priority patent/EP1953982B1/fr
Priority to DE602007014174T priority patent/DE602007014174D1/de
Priority to US12/069,022 priority patent/US20080279322A1/en
Publication of EP1953982A1 publication Critical patent/EP1953982A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • H04L27/2663—Coarse synchronisation, e.g. by correlation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers

Definitions

  • the present invention relates generally to wireless communication systems, using transmission techniques like OFDM (Orthogonal Frequency Division Multiplexing) or OFDMA (Orthogonal Frequency Division Multiple Access), and more particularly to a set of techniques for timing synchronization and neighbor scanning in OFDM cellular systems. More precisely, according to a first aspect, the invention relates to a device for processing an incoming signal in a wireless communication system, said incoming signal being sent by a base station and comprising successive frames, each of which comprising at least a training symbol or preamble correlated to said base station, and a data symbol carrying message data.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDMA Orthogonal Frequency Division Multiple Access
  • Orthogonal Frequency Division Multiplexing is a transmission technique, where a data stream is multiplexed over multiple orthogonal subcarriers, yielding a longer symbol period which is advantageous in multipath conditions.
  • Orthogonal Frequency Division Multiple Access is a variant of OFDM, where the available spectrum is used simultaneously by multiple users which are using different orthogonal subcarriers.
  • OFDM generally decreases the Inter-Symbol Interference (ISI) by inserting a guard interval (GI) between OFDM symbols in order to maintain the orthogonality between the subcarriers, the guard interval being generally longer than the maximum delay spread of a channel. Timing synchronization between a transmitter and a receiver must be obtained in order to maintain the orthogonality between the subcarriers and thus enabling proper demodulation of the data.
  • ISI Inter-Symbol Interference
  • GI guard interval
  • an object of the invention is to provide a device mainly characterized in that it comprises at least:
  • the timing synchronization and scanning module may be further suitable to provide one or more signal quality measurements of said training symbol, for example signal power, or noise plus interference power.
  • the device can further comprise a control module suitable for sending at least a command to the timing synchronization and scanning module via a command interface, and receiving at least a processing result from the timing synchronization and scanning module via statistics interface in response to said command.
  • a control module suitable for sending at least a command to the timing synchronization and scanning module via a command interface, and receiving at least a processing result from the timing synchronization and scanning module via statistics interface in response to said command.
  • the incoming signal being for example an OFDM signal type and the training symbol is preferably a well-known training symbol also called preamble.
  • the second module may implement means of a discrete Fourier transform, said means of a discrete Fourier transform are for example means of fast Fourier transform.
  • the timing offset may be processed by averaging, filtering or any other means reducing synchronization errors.
  • the timing synchronization and scanning module may be suitable for processing, based on commands from a control module, a plurality of training symbols sent at least by a serving base station and a neighbour base station, and providing timing offset and signal quality measurement of each training symbol to the control module, only the timing offset corresponding to the training symbol correlated to the serving base station are sent to the timing post processing module.
  • the training symbol is for example sent by different bases stations in neighbour cells.
  • the timing synchronization and scanning module can further process a plurality of successive frequency domain symbols, based on commands from the control module.
  • the timing synchronization and scanning module comprises at least:
  • the preamble processing module may also provide the signal quality measurement.
  • the statistic processing module (13) may also send the signal quality measurement.
  • the frequency domain correlation module comprises at least:
  • the windowing module may be placed anywhere on the data path as long as it is in the frequency domain.
  • the frequency domain correlation module may further comprise:
  • the preamble processing module comprises at least:
  • the said preamble post processing module may comprise further a means of computing signal quality indicators.
  • the discriminator compares the signal power to a predetermined threshold and interpreting the samples above the threshold as a useful signal, and by zeroing the samples below the threshold, considered noise and interference.
  • the preamble processing module is further capable of jointly processing at least two channel impulse responses corresponding to at least two successive symbols.
  • the preamble processing module is further capable to compute a metric for each of the two discriminated channel impulse responses corresponding to successive symbols, for instance the signal power.
  • the preamble processing module can select and discriminate the useful taps for both channel impulse responses by using the discriminated channel impulse response and the highest metric amongst the two metrics.
  • the preamble processing module may further combine coherently the channel impulse responses for the two symbols by using their constant phase relationship.
  • the timing offset may be computed as an average delay of the discriminated channel impulse responses.
  • the average delay of the discriminated channel impulse response CIR may be computed as follows:
  • the timing synchronization and scanning module may further comprise a preamble post processing module refining the results of the preamble processing module from two consecutive training symbols in order to correct the ambiguity in timing offset and the error in signal quality measurements.
  • the preamble post processing module is based on useful signal power on the two consecutive symbols to determine the error in timing offset and signal quality measurements, by look-up tables or equivalent means.
  • the detection interval for the timing offset can be limited to a predetermined or known interval and thus increasing the reliability o the detection.
  • a limited number of consecutive samples can be used for determining the timing offset.
  • the statistics processing module can also be used to find the best match for a preamble when the detection interval is a plurality of symbols by performing a maximum search, for example on power of the discriminated channel impulse symbol.
  • the statistics processing module can be used in such a way that only the statistics for the best match are provided to the control module.
  • the statistics processing module can be used to filter the results by invalidating the detections for certain preambles, for instance if the timing offset is too high
  • the proposed device operates at the output of the Fast Fourier Transform module, on the extracted for demodulation (groups of N samples representing the FFT of the N-sample data symbols separated by guard intervals). Hence, the scanning is performed seamlessly during normal data reception.
  • Another object of the invention is a method for implementing a device described above, in a timing tracking of a serving base station mode, comprising at least the steps of:
  • the timing synchronization and scanning module may return to a control module, via a statistics interface, the detection decision, the timing offset, and the signal quality indicators, if available.
  • the method further comprises at least the steps of:
  • the timing synchronization and scanning module may return to the control module via the statistics interface one set for each of the preamble index in the list, a set comprising:
  • the method further comprises at least the steps of:
  • the timing synchronization and scanning module may return to the control module via the statistics interface one set for each of the preamble index in the list, a set comprising:
  • the number of frequency domain symbols where the preambles are going to be searched may be equal to or greater than the number of symbols in a frame.
  • the method may comprise a power up algorithm which comprises:
  • timing synchronization and scanning module may also comprise the following steps:
  • An OFDM signal consists of multiple signals, each modulating a subcarrier.
  • the sampling period is denoted by T s , which is a system parameter chosen according to the bandwidth of the system.
  • the data portion of an OFDM symbol consists of N samples and its length is NT s .
  • a guard interval consisting of N GI samples is inserted between successive OFDM symbols forming the OFDM signal in order to combat inter-symbol interference.
  • each data frame of a wireless system may include one or more training symbols such as for example preamble symbols, or pilot symbols.
  • a preamble symbol may be a training symbol at the beginning of each data frame.
  • the preamble symbol may be used for various synchronization tasks.
  • a pilot symbol may be a training symbol to provide tracking information, which may be associated for example with a spatial channel.
  • the transmitted symbol is denoted by X N (k), which is a sequence of complex numbers which will modulate the subcarriers.
  • a generic data communication system is depicted in figure 1 . It comprises a transmitter that converts upper layer data in an analog signal, a communication channel h(t), and a receiver which translates the received analog signal into data for upper layers.
  • the transmitted signal x(t) is altered by the communication channel.
  • FIG. 2 A typical cellular system is depicted in figure 2 , where BS stands for base station and MS stands for mobile station. It is known that an MS receives signals from multiple base stations, which can be harmful from interference point of view, but it is beneficial in the sense that the MS can perform handover when said MS detects that the signal from a BS is better than the signal of the BS that the MS is currently communicating with (serving BS). For example, the BS sends periodically a well-known or current training sequence referred to as preamble.
  • a single preamble is considered in the equations, in reality the signal received is a combination of signals from multiple base stations each with its own preamble sequence.
  • a preferred embodiment of the present invention is depicted in figure 4 , where the MS has to perform the following tasks: first, it has to find the point in time where to start sampling the signal received from the serving base station for proper demodulation (or timing synchronization) and second, it has to scan for neighbor base stations in order to have a good picture of the timing offset and signal quality for serving base station and the neighbor base stations.
  • t n ⁇ T s + ⁇ r
  • the sampled signal r ( n ) will be further processed by means of a discrete Fourier transform 02, for example a fast Fourier transform (FFT).
  • FFT fast Fourier transform
  • the structure of the received symbol is, after performing the discrete Fourier transform:
  • R N k FFT r n ⁇
  • the parameter ⁇ r is used to select the correct timing offset where the input signal is sampled, thus realizing the timing synchronization.
  • the timing synchronization and scanning module 10 can be used in two modes. In a first operating mode, it will track a timing offset or delay ⁇ of the preamble of the serving base station (which will be referred as the current preamble or current training symbol) in order to properly demodulate the data. It will also gather the timing offset along with signal quality measurements (like for example received signal power and signal to interference plus noise ratio) and send them to a control module 30 (via a statistics channel).
  • signal quality measurements like for example received signal power and signal to interference plus noise ratio
  • the timing synchronization and scanning module 10 In a second operating mode, under the supervision of the control module 30 which will send commands to the timing synchronization and scanning module 10 (via the command channel), the timing synchronization and scanning module 10 will scan other preambles in an attempt to find neighbor base stations. The timing offset of the preambles scanned along with signal quality measurements are provided back to the control entity via the statistics channel.
  • the control entity can be autonomous or it can be directed by neighbor advertising (information about the neighbor base stations sent by the serving base station).
  • neighbor advertising information about the neighbor base stations sent by the serving base station.
  • a distinctive feature of the proposed receiver is that the timing synchronization and scanning module operates at the output of a discrete Fourier transform module 02, on the symbols extracted for demodulation (groups of N samples representing the fast Fourier transform of the N-sample data symbols separated by guard intervals).
  • the scanning can be performed seamlessly during normal data reception.
  • the rest of the modules depicted figure 4 is typical for an OFDM receiver.
  • the complex channel coefficients are estimated and are compensated for in the received signal by the channel estimation and compensation module 03.
  • the compensated signal is further processed by a slicer module 04 and a forward error correction decoder 05. Finally, the data is sent to upper layers.
  • timing synchronization and scanning module is described showing the functionality of each sub-module.
  • the structure of timing synchronization and scanning module 10 is depicted figure 5 .
  • the output of the discrete Fourier transform 02 or N-point IFFT, denoted by R N ( k ) is passed through a frequency domain correlation (FDC module) 11, which is controlled by the Control module 30 via the commands channel.
  • the output of the FDC module 11 is a channel impulse response CIR for the specific preamble (or current training symbol) commanded by the control module (in the case of tracking the preamble is the current preamble, i.e.
  • the channel impulse response CIR is further processed by a preamble processing module 12 to get estimates of the timing offset ⁇ , a signal power as well as noise and interference power.
  • the preamble processing module 12 also makes a decision if a specific preamble was present or not.
  • the preamble post processing module 14 can be bypassed for tracking, and can be is used for example for combining the results of two successive OFDM symbols processed by other functions.
  • a statistics processing module 13 can be used to send the detection of a specific preamble decision with the timing offset information and the signal quality measurement to the control module 30 via the statistics channel.
  • the statistics processing module 13 can also be used to further filter results of the commanded operations.
  • the timing offset ⁇ of the current preamble will be provided to the timing post-processing module 20 for further processing to generate an improved estimate ⁇ r used to start sampling by the analog front-end and digital front-end module 01, as explained above.
  • the structure of the Frequency domain correlation (FDC) module 11 is depicted in figure 6 .
  • a scheduler 111 is responsible of translating the commands from the control module 30 to local control signals and hence FDC module 11 can perform different functions under the supervision of the control module 30.
  • the index of the preamble to be used in the correlation is input to a look-up table (LUT) 112 to get the needed preamble sequence.
  • a decimation offset s i corresponding to the same index is provided to a decimation module 113.
  • Each N-sample block from the output of the N-point FFT 02 is provided to the synchronization and scanning module 10 along with a timestamp corresponding to the first sample of the block in the time domain.
  • the scheduler 111 is used to control for example a multi-page memory 114 and also the processing for the purpose of accommodating different functions.
  • the output of the decimation module 113 can be directly sent to a de-convolution module 115.
  • an additional offset can be applied to the decimation module corresponding to frequency offset hypothesis (with granularity equal to the inter-carrier spacing). For a single FFT output and a single preamble index more de-convolutions can be performed, one for each frequency offset hypothesis.
  • the preamble sequences can also modulate only a part of the subcarriers (denoted here by M ) , equally spaced at intervals of T subcarriers which will yield a T -times repetition of a sequence in the time domain.
  • a means of inverse discrete Fourier transform module (or L-point IFFT module) 116 analyzes the content of Y L which will give us an estimate of the channel impulse response ( CIR L ) .
  • Y L Prior to the L-point IFFT module, Y L will be multiplied with a windowing 117 function W L in order to remove the discontinuity at the edges of the transmitted spectrum (between Y L (- L /2) and Y L ( L /2-1) for example).
  • the windowing 117 can be placed after the de-convolution module 115 or anywhere from the output of the N- point FFT module 117 to the input of the L-point IFFT module 116.
  • the channel impulse response CIR L is further analyzed by the preamble processing module 12, which functions are: first, to decide if the preamble is present, second to compute the timing offset ⁇ , and third to compute signal quality measurement.
  • the input CIR L is the channel impulse response, but it should be kept in mind that it is sampled with a sampling period equal to N LT ⁇ T s in this embodiment.
  • a possible implementation of preamble processing is depicted in figure 7 . Those skilled in the art can imagine different implementations without departing from the intent of the present invention.
  • the interval of d can be restricted to a smaller interval centered around an expected bias d offset , if the control entity decides to track the serving base station preamble in a smaller interval called tracking window. If there is no information on the expected bias of the timing offset, d offset shall be set to zero.
  • the detection is successful if at least one value of P t ( d ) is non-zero.
  • Two sliding sums are used for P t ( d ) and d ⁇ P t ( d ) to measure in a wanted window referred to as summing window, typically equal to the guard interval length.
  • SP t n ⁇ d ⁇ n + ⁇ summing window > P t d
  • SDP t n ⁇ d ⁇ n + ⁇ summing window > d ⁇ P t d
  • the measure n ⁇ tracking window > is the center of the summing window chosen based on the expected variation of the channel impulse response.
  • the maximum value of SP t is kept (the CIR with the highest power in a window) as well as the corresponding SDP t .
  • the timing offset detection is limited to the interval d avg ⁇ d offset + - L 2 , L 2 - 1
  • the tracking window and summing widow are smaller, the detection will be limited to the tracking window plus the summing window and centered around the bias d offset .
  • the discriminated power of the channel impulse response P t ( d ) will be used to evaluate the power of the wanted signal.
  • the measure before discrimination will be used.
  • the samples outside the a priori known interval of expected time offsets can be used.
  • P th can be calculated as psd N+1 multiplied with a constant
  • the noise plus interference power measurements can be measured by subtracting the power of the discriminated signal from the total power.
  • the statistics processing module 13 will pack the detection decision with the timing information and the signal quality measurements (signal power, noise and interference power, signal to noise plus interference ratio, etc.) and send the information to the control module 30 via the statistics channel.
  • a detection can be invalidated if the timing offset is too high, and it will be disregarded by the timing post-processing module. This way, the system will be more robust and it will stay locked even in harsh conditions. Those skilled in the art can imagine other criteria to invalidate the detection of the preamble.
  • the other function of the proposed system is neighbor scanning, which translates into processing the received signal in an attempt to find the preamble sequences sent by the neighbor base stations and to measure the timing offset and signal quality indicators.
  • the second operating mode also called scanning.
  • the processing is similar to tracking (first operating mode) of the current preamble, with some differences which will be described in the following.
  • the control module 30 can request several preambles to be tested on the same FFT window.
  • the preambles can have different decimation offsets.
  • the distinct decimated versions are stored in different pages of the multi-page memory, and they can be processed further without real-time constraints during the rest of the frame.
  • For a given decimation offset all the preambles having that specific decimation offset may be tested. It is desirable that the windowing is done prior to the de-convolution in order to do it once for all preambles using the same decimation offset.
  • the tracking and summing windows may be chosen in order to maximize the capturing window.
  • the scanning for synchronous networks with large cells is somewhat different: the N -point FFT results for all of the needed symbols are stored after decimation (three symbols in the example) in order to allow non-real time processing of many preamble sequences.
  • the group of preambles that need to be tested should have the same decimation offset.
  • other scheduling and storing mechanisms can be imagined, for instance if a small number of preambles need to be tested they can be processed in real time taking advantage of the reduced complexity (the complexity of an L -point IFFT is less than L / N the complexity of an N -point FFT), using the memory as a buffer or as a FIFO (first in first out).
  • the preamble processing module is modified in order to jointly process two adjacent OFDM symbols since the preamble can be anywhere in between symbols due to large delay spread. If a preamble is part on the first symbol and part on the second symbol, the phase relationship between the CIR L for the two symbols is known (depends on the length of the guard interval and the decimation offset). The known phase relationship might be used for coherent combining.
  • the preamble processing module 14 illustrated in figure 8 will have in this case a set of outputs for each pair of adjacent OFDM symbols.
  • the preamble post processing module will be used to remove the timing uncertainty based on the power of the two discriminated CIRs (the correction factor is an integer multiple of the length of the basic sequence repeated N T ⁇ T s and is determined by look-up tables or threshold methods or any other means, as a function of timing offset and power of the two discriminated CIRs).
  • another correction is applied (the power is split between the two symbols).
  • the power correction factor is determined by look-up tables or threshold methods or any other means, as a function of timing offset and power of the two discriminated CIRs.
  • the statistics processing module 13 a maximum search is performed on the partial results. For detection on K symbols (3 in our example), K -1 pairs of symbols are processed by the preamble processing module ( ⁇ 1,2 ⁇ , ⁇ 2,3 ⁇ , ..., ⁇ K -1, K ⁇ ), hence K -1 sets of statistics are available, one for each pair processed. The K -1 results are further refined by the preamble post-processing module.
  • the statistics processing module will first determine if a detection occurred (at least one of the K -1 results indicates a detection), then a maximum search is performed on the power measurement, and the other corresponding measurements are packed with the power measurement and sent to the control entity via the statistics channel. Conversely, all of the measurements can be provided to the control entity without filtering by maximum search. Moreover, only the measurements for the detections can be provided.
  • the processing for asynchronous networks is very similar to the processing for large cells in synchronous networks, the only difference being that the search interval is considerably larger, in order to cover a frame length (the preamble is sent every frame at fixed positions in a periodic fashion), as shown in figure 9 and in figure 10 . Consequently, since the processing is done on a large number of symbols, in order to use a reasonable amount of memory, the processing will be done in real-time using the memory 123 as a buffer or as a FIFO, and a smaller number of preambles can be processed in a multiplexed fashion. This is possible because of the reduced complexity of the L -point IFFT compared to the N -point FFT. During the processing of the N -point FFT, more than N / L preambles can be processed (more than four in the preferred application).
  • the proposed device is capable of scanning for neighbor base stations in all types of deployments.
  • the proposed invention is flexible enough to accommodate other functions like soft combining for macro-diversity, multiple receive chains, etc.
  • Other functions can be accommodated by combining the basic functions described in this invention.
  • the power up strategy becomes evident. Due to the low complexity, a fast power-up is possible.
  • a cell search is performed (using scanning for asynchronous networks for a subset of the preambles and for a given frequency offset hypothesis).
  • the preambles detected are further analyzed with a 3-symbol acquisition window (using scanning for synchronous networks, large cells).
  • the frame structure is established and the receiver will enter the steady-state tracking mode (optionally synchronous scan for small cells can be used to select the best base station). Once the receiver is in tracking mode, it may immediately continue scanning in order to find a better base station. At any time, the scanning can be done in parallel with normal data reception in a seamless fashion.
  • a comprehensive set of techniques is provided to ensure timing synchronization from power-up to functional steady-state timing tracking.
  • all types of scanning are available and therefore they can be used in all type of deployments, for example in mobile point-to-multipoint applications deployed in a cellular network.
  • the low complexity of the algorithms yields the low power consumption in mobile applications, allowing for instance portable terminals with reasonable battery autonomy.
  • the scanning can be done quickly and during the data reception, minimizing the need for special scanning intervals, and hence allowing the mobile station to sleep more in order to conserve its power.
  • a reasonable time for power-up to operational state in order of seconds
  • a preferred application is the OFDMA physical layer based on a 1024 point FFT of the IEEE 802.16 standard. This invention applies (but it is not limited) to mobile stations.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
EP07290144A 2007-02-05 2007-02-05 Procédé et dispositif de synchronisation temporelle et d'analyse voisine pour les systèmes cellulaires OFDM Not-in-force EP1953982B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT07290144T ATE507644T1 (de) 2007-02-05 2007-02-05 Verfahren und vorrichtung zur zeitsynchronisation und scanning von nachbarzellen für zelluläre ofdm-systeme
EP07290144A EP1953982B1 (fr) 2007-02-05 2007-02-05 Procédé et dispositif de synchronisation temporelle et d'analyse voisine pour les systèmes cellulaires OFDM
DE602007014174T DE602007014174D1 (de) 2007-02-05 2007-02-05 Verfahren und Vorrichtung zur Zeitsynchronisation und Scanning von Nachbarzellen für zelluläre OFDM-Systeme
US12/069,022 US20080279322A1 (en) 2007-02-05 2008-02-05 Method and device for timing synchronization and neighbor scanning for cellular OFDM systems

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EP07290144A EP1953982B1 (fr) 2007-02-05 2007-02-05 Procédé et dispositif de synchronisation temporelle et d'analyse voisine pour les systèmes cellulaires OFDM

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EP1953982A1 true EP1953982A1 (fr) 2008-08-06
EP1953982B1 EP1953982B1 (fr) 2011-04-27

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CN102870465A (zh) * 2009-07-06 2013-01-09 岩星比德科有限公司 用于无线通信的方法和设备
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CN107078988A (zh) * 2014-09-22 2017-08-18 国家科学和工业研究组织 在低延时高速通信系统中使用的线性均衡
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US10116478B2 (en) 2001-10-17 2018-10-30 Blackberry Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
US9503300B2 (en) 2001-10-17 2016-11-22 Blackberry Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
US10693693B2 (en) 2001-10-17 2020-06-23 Blackberry Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
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CN102172076B (zh) * 2008-10-06 2015-04-01 高通股份有限公司 用于在时间同步的无线通信系统中扫描邻居基站的方法和装置
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EP2296332A1 (fr) * 2009-09-10 2011-03-16 ST-Ericsson (France) SAS Détection de signal de synchronisation primaire de faible complexité dotée d'une estimation grossière du décalage de fréquence pour un système de communication LTE sans fil
WO2011029793A1 (fr) * 2009-09-10 2011-03-17 St-Ericsson (France) Sas Détection de signal de synchronisation primaire de faible complexité à estimation de décalage de fréquence grossière pour système de communication sans fil lte
US9860894B2 (en) 2012-11-30 2018-01-02 Commonwealth Scientific And Industrial Research Organisation Wireless backhaul system
CN104272831A (zh) * 2013-02-05 2015-01-07 华为技术有限公司 通信资源的分配方法、基站及用户设备
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US20080279322A1 (en) 2008-11-13
DE602007014174D1 (de) 2011-06-09
EP1953982B1 (fr) 2011-04-27
ATE507644T1 (de) 2011-05-15

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